Portable Braille Reading Device with Electromagnetic Actuators

2019 ◽  
pp. 310-315
Author(s):  
Daniel Aparicio ◽  
Andhers Piña ◽  
Alexis Bustamante
Keyword(s):  
Electromagnetic Actuators ◽  
Reading Device

Add-on laser reading device for a camera phone

2005 ◽  
Author(s):  
Jukka-Tapani Mäkinen ◽  
Karri Niemelä ◽  
Hannu Vasama ◽  
Rauno Mattila ◽  
Mika Aikio ◽  
...  
Keyword(s):  
Camera Phone ◽  
Reading Device

Active Vibration Control of a Multimode Rotor-Bearing System Using an Adaptive Algorithm

1986 ◽  
Vol 108 (2) ◽  
pp. 230-231 ◽  
Author(s):  
A. V. Metcalfe ◽  
J. S. Burdess
Keyword(s):  
Active Vibration Control ◽  
Rotation Frequency ◽  
External Control ◽  
Electromagnetic Actuators ◽  
Mass Unbalance ◽  
Rotor Bearing ◽  
Active Vibration ◽  
Control Forces ◽  
Bearing System ◽  
Uncontrolled System

A method for minimizing forced harmonic vibration of a rotor-bearing system by the application of external control forces is presented. The frequency of the vibration is assumed known. In cases of mass unbalance or bend in the shaft this will be shaft rotation frequency and can usually be monitored without difficulty. The control forces could be provided by electromagnetic actuators. The control strategy presented does not require any knowledge of the system parameters and, provided the uncontrolled system is stable, cannot destablize the system. Results from a simulation are shown.

Tunable Membrane for Electromagnetic Devices Using Dielectric Elastomers

2008 ◽  
Vol 61 ◽  
pp. 141-146
Author(s):  
Christian Bolzmacher ◽  
Karin Bauer ◽  
Ulrich Schmid ◽  
Helmut Seidel ◽  
Moustapha Hafez
Keyword(s):  
Material Model ◽  
Silicone Membrane ◽  
Creep Data ◽  
Electromagnetic Actuators ◽  
Membrane Behavior ◽  
Electromagnetic Devices ◽  
Dynamic Experiments ◽  
Experimental Creep ◽  
Strain Relationship ◽  
Tunable Stiffness

The amplitudes of miniaturized electromagnetic actuators are clearly enhanced if the eigenfrequencies of the membrane are used for actuation. However, the bandwidth for such operation is very limited. This can be overcome to some extent by the employment of membranes with electrically tunable stiffness. In this context we investigated membranes of dielectric elastomer materials and present experimental results on the ability to change their pre-strain to shift the eigenmodes to lower frequencies upon activation. Furthermore, the viscoelastic properties of an acrylic and a silicone membrane are investigated and compared to dynamic experiments. The parameters for the stiffness and viscoelasticity are derived from the experimental creep data and incorporated in a hyperelastic material model. Using this adapted stress-strain relationship the membrane behavior over time can be evaluated for different loading as well as pre-strain conditions.

Self-Sensing Active Vibrations Control Using Electromagnetic Actuators

2021 ◽  
Author(s):  
Beatriz Marangoni ◽  
Felipe Carvalho ◽  
Marcus Vinicius Fernandes de Oliveira ◽  
Aldemir Ap Cavalini Jr ◽  
Valder Steffen Jr
Keyword(s):  
Electromagnetic Actuators

scholarly journals Static force characteristics of electromagnetic actuators for Braille screen

2011 ◽  
Vol 24 (2) ◽  
pp. 157-167 ◽  
Author(s):  
Ivan Yatchev ◽  
Krastio Hinov ◽  
Iosko Balabozov ◽  
Kristina Krasteva
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Static Force ◽  
The Finite Element Method ◽  
Electromagnetic Actuators ◽  
Minimum Force ◽  
The Magnetic Field ◽  
Force Characteristics

Several constructions of electromagnetic actuators with moving permanent magnet for Braille screen are studied. All they are formed from a basic one that consists of two coils, core and moving permanent magnet. The finite element method is used for modeling of the magnetic field and for obtaining the electromagnetic force acting on the mover. The static force-stroke characteristics are obtained for four different constructions of the actuator. The constructions with ferromagnetic disc between the coils ensure greater force than the ones without disc and can reach the required minimum force.

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